Jepson eFlora
Key to families | Table of families and genera

Key to Utricularia

View taxon page for Utricularia

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Leaves simple, flattened; stolons subterranean; cleistogamous flowers common; bracts peltate ..... U. subulata

1' Leaves dissected into 2–many thread-like to flattened ultimate segments; stolons free-floating, loosely rooted, or subterranean; cleistogamous flowers rare; bracts attached at base

2. Stems generally of 1 kind (sometimes weakly of 2 kinds in Utricularia minor), with bladders, leaves throughout

3. Leaf 15–90 mm, ultimate segments > 30, margin bristles 0.1–0.3 mm; stem 30–150 cm; peduncle 1–3 mm diam; bladder glands with long arm-pair parallel or diverging slightly, short arm-pair diverging by 90–180° ..... U. macrorhiza

3' Leaf 2–15 mm, ultimate segments 2–22, margin bristles 0 or microscopic; stem 5–30 cm; peduncle 0.4–0.8 mm diam; bladder glands with long arm-pair diverging slightly, short arm-pair diverging slightly or by 270–300°

4. Ultimate leaf segments 2–6(8); corolla upper lip >= lower, spur ± = lower; bladder glands with both arm-pairs diverging slightly ..... U. gibba

4' Ultimate leaf segments 7–22; corolla upper lip, spur both <= 1/2 × lower lip; bladder glands with long arm-pair diverging slightly, short arm-pair diverging by 270–300° (so all 4 arms oriented in same direction) ..... U. minor (2)

2' Stems clearly of 2 kinds, green (in water or at surface; leaves with flattened or thread-like segments; bladders 0–few) and white (generally buried in substrate; leaves 0; bladders many)

5. Ultimate leaf segment margins without bristles; leaf segments ± thread-like to flattened; corolla 6–8 mm; bladder glands with long arm-pair diverging slightly, short arm-pair diverging by 270–300° (so all 4 arms oriented in same direction) ..... U. minor (2)

5' Ultimate leaf segment margins with bristles 2–12, 0.08–0.16 mm; leaf segments flattened; corolla 1–1.6 cm; bladder glands with long arm-pair diverging by 0–45°, short arm-pair diverging by 0–160°

6. Ultimate leaf segment margins with 5–12(20) bristles, ± entire; leaf segment tips obtuse; bladders on leafless shoots, rarely on leafy shoots; corolla spur < or ± = lower lip; bladder glands with both arm-pairs diverging by generally 0–30° ..... U. intermedia

6' Ultimate leaf segments margins with 1 bristle on each of 2–7(10) teeth; leaf segment tips acute; bladders on leafless shoots, also often ± few on leafy shoots; corolla spur ± 1/2 × lower lip; bladder glands long arm-pair diverging by 20–45°, short arm-pair diverging by 40–160° ..... U. ochroleuca

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Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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